Variable-geometry turbocharger with asymmetric divided volute for engine exhaust gas pulse optimization

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(11)

EP 2 022 963 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	06.06.2012 Bulletin 2012/23

(43)	Date of publication A2:
	11.02.2009 Bulletin 2009/07

(21)	Application number: 08161608.8

(22)	Date of filing: 31.07.2008

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International Patent Classification (IPC):

F02C 6/12^(2006.01)
F02B 37/02^(2006.01)

F01D 9/02^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA MK RS

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Priority:

06.08.2007 US 834115

(71)	Applicant: Honeywell International Inc.
	Morristown, NJ 07960 (US)

(72)	Inventor:
	Serres, Nicolas Honeywell Int. Inc. Patent Ser.M/S-AB/2B Morristown NJ07962-2245 (US)

(74)	Representative: Buckley, Guy Julian
	Patent Outsourcing Limited 1 King Street Bakewell Derbyshire DE45 1DZ Bakewell Derbyshire DE45 1DZ (GB)

(54)	Variable-geometry turbocharger with asymmetric divided volute for engine exhaust gas pulse optimization

(57) A turbine assembly for a variable-geometry turbocharger includes a turbine housing defining a divided volute having first and second scrolls, wherein the first scroll has a substantially smaller volume than the second scroll. The first scroll feeds exhaust gas to a first portion of a turbine wheel upstream of the throat of the wheel, while the second scroll feeds gas to a second portion of the wheel at least part of which is downstream of the throat. Flow from the second scroll is regulated by a sliding piston. The first scroll can be optimized for low-flow conditions such that the turbocharger can operate effectively like a small fixed-geometry turbocharger when the piston is closed. The turbine housing defines an inlet that is divided by a dividing wall into two portions respectively feeding gas to the two scrolls, a leading edge of the dividing wall being downstream of the inlet mouth.

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